It is possible to choose the duration for which your IP address range will be leased. You can specify it in 'Subnet availability' field and by default, the whole subnet that you bring will be able to freely roam across all geographical regions where Heficed has a PoP (Point of Presence) infrastructure. 

If you choose to disable a specific RIR (Regional Internet Registry) region, the IP address range will become unavailable to be attached to any service in such region.
You can find RIR region map here:

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